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[dih-mon-struh-buh l, dem-uh n-] /dɪˈmɒn strə bəl, ˈdɛm ən-/
capable of being demonstrated or proved.
clearly evident; obvious:
a demonstrable lack of concern for the general welfare.
Origin of demonstrable
1350-1400; Middle English < Old French < Late Latin dēmonstrābilis, equivalent to Latin dēmonstrā(re) (see demonstrate) + -bilis -ble
Related forms
demonstrability, demonstrableness, noun
demonstrably, adverb
nondemonstrability, noun
nondemonstrable, adjective
nondemonstrableness, noun
nondemonstrably, adverb
undemonstrable, adjective
undemonstrableness, noun
undemonstrably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for demonstrably
Contemporary Examples
Historical Examples
  • If it does not hear the signal, it is demonstrably off the straight route.

  • These are the two most popular theories, and both are demonstrably false.

    Henry VIII. A. F. Pollard
  • It is not a question of what is demonstrably best, but of what best suits you.

    Art in Needlework Lewis F. Day
  • Yet it was demonstrably the injection that killed Overbury if he was killed by poison at all.

    She Stands Accused Victor MacClure
  • Meilhan was demonstrably lying to conceal Mme Lacoste's liberality.

    She Stands Accused Victor MacClure
British Dictionary definitions for demonstrably


/ˈdɛmənstrəbəl; dɪˈmɒn-/
able to be demonstrated or proved
Derived Forms
demonstrability, demonstrableness, noun
demonstrably (ˈdɛmənstrəblɪ; dɪˈmɒn-) adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for demonstrably



c.1400, from Latin demonstrabilis, from demonstrare (see demonstration). Related: Demonstrably.

Online Etymology Dictionary, © 2010 Douglas Harper
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